/**
 * (C) Copyright IBM Corp. 2010, 2015
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 */

package com.ibm.bi.dml.runtime.controlprogram.parfor;

import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.io.WritableComparator;

public class ResultMergeRemoteSorting extends WritableComparator
{
	
	
	protected ResultMergeRemoteSorting()
	{
		super(ResultMergeTaggedMatrixIndexes.class, true);
	}
	
	@SuppressWarnings("rawtypes")
	@Override
    public int compare(WritableComparable k1, WritableComparable k2) 
	{
		ResultMergeTaggedMatrixIndexes key1 = (ResultMergeTaggedMatrixIndexes)k1;
		ResultMergeTaggedMatrixIndexes key2 = (ResultMergeTaggedMatrixIndexes)k2;

		int ret = key1.getIndexes().compareTo(key2.getIndexes());
		if( ret == 0 ) //same indexes, secondary sort
		{
			ret = ((key1.getTag() == key2.getTag()) ? 0 : 
				   (key1.getTag() < key2.getTag())? -1 : 1);
		}	
			
		return ret; 
		
    }
}
